CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015
Income Statement [Abstract]
Revenues	$ 184,059	$ 169,498	$ 376,187	$ 330,405
Cost of revenues	77,527	62,952	161,306	124,625
Gross profit	106,532	106,546	214,881	205,780
Operating expenses:
Research and development	41,750	35,301	91,398	69,055
Selling, general and administrative	37,415	29,227	76,231	57,370
Total operating expenses	79,165	64,528	167,629	126,425
Operating income	27,367	42,018	47,252	79,355
Interest expense	(4,217)	0	(8,365)	0
Interest income and other, net	1,620	1,016	3,272	2,834
Income before income taxes from continuing operations	24,770	43,034	42,159	82,189
Income tax expense (benefit)	179	611	(3,379)	1,046
Net income from continuing operations	24,591	42,423	45,538	81,143
Discontinued operations:
Loss from discontinued operations before income taxes	0	0	0	(547)
Income tax expense	0	0	0	15
Net loss from discontinued operations	0	0	0	(562)
Net income	$ 24,591	$ 42,423	$ 45,538	$ 80,581
Basic net income per share - continuing operations (in dollars per share)	$ 0.18	$ 0.29	$ 0.34	$ 0.55
Basic net income per share - discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00
Basic net income per share (in dollars per share)	0.18	0.29	0.34	0.55
Diluted net income per share - continuing operations (in dollars per share)	0.18	0.28	0.33	0.53
Diluted net loss per share - discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00
Diluted net income per share (in dollars per share)	$ 0.18	$ 0.28	$ 0.33	$ 0.53
Weighted average shares:
Basic (in shares)	134,186	147,724	134,059	148,058
Diluted (in shares)	137,206	152,152	137,698	152,997